Sewer-trap.



G. w. MOON.

SEWER TRAP.

lE-E- f nl;

Patented Apr. 27, 1915.

' of `the basin,

GEORGE W. MOON, OF ST. LOUIS, MISSOURI.

SEWER-TRAP.

Specication of Letters Patent.

Patented Apr. 27, 1915.

Application led, October 19, 1914. Serial No. 867,387.

To all whom it may concern Be it known that l, GEORGE W. MOON, a vcitizen of the United States, residing at St. Louis, State of Missouri,have invented certain new and useful Improvements in Sewer- Traps, ofwhich the following is a full, clear, and exact description, referencebeing had to the accompanying drawings, forming a part hereof.

My invention has relation to improvements in valve-controlledl sewertraps; and it consists in the novel features of construction more fullyset forth in the specification and pointed out in the claim.

In the drawings, Figure 1 is a middle vertical section taken through apreferred form of trap; Fig. 2 is a horizontal crosssection on theline-2 2 of Fig. 1; Fig. 3 is a detached view of the valve in sideelevation; Fig. 4 is a detached view of the valve-seat member and guidein side elevation; Fig. 5 is a side elevation of the ring supporting thevalve-seat member; and Fig. 6 is a section similar to Fig. 1 showing amodified construction of trap.

The present invention has for its object the construction of a sewertrap which will eiectively prevent not only7 the discharge of back-waterthrough the trap but at the same time prevent the escape of foul andnoxious sewer gas through the trap into the room or other place wherethe trap may be installed.

'A further object is to construct a trap the valve of which will readilyand instantly respondto any back pressure through the trap; one which issimple, durable, cheap to construct and easy ,to install; and onepossessing further and other advantages better apparent from a detaileddescription of the invention which is as follows.v

Referring to the drawingsand for the present to Figs. 1 to 5 inclusive,1 represents a collecting basin set into the concrete or other floor C,and provided with the usual grating 2 to the under side of which visattached the bell or deector 3, these features being well understood inthe art. Formed with (or carried by) the basin 1 is a central hollowcylindrical boss or hub 4 projecting partly below and partly above thebottom the upper portion of said hub extending into the bell 3" to apoint above the plane of the lower edge of the said bell and spaced fromthe bell, the free end of said upper portion being spanned by a wire orequivalent screen or strainer 5 secured portion 10 in place in anysuitable mechanical manner. The axis of the hub 4 (about which the bellis symmetrically disposed) is coincident with the axis of the upperportion of the soil or sewer pipe 6, whose upper terminal is formed intoan enlargement 6', the upper face of the vshoulder s at the base of theenlargement serving to support the more or less conical cast iron ring 7between which and the inner wall of the enlarged portion 6 of the sewerpipe is placed a bottom packing ring of oakum 8 partially supported bythe shoulder s (and partially by the walls of the ring 7), and an Vupperpacking ring 9 of lead or its equivalent, the upper end of the ring 9and thecorrespondmg ends of the portions 6 and ring 7 terminating insubstantially the same horizontal plane (Fig. 1). The upper thickenedportion of the ring` 7 is interiorly screw threaded, said `screwthreaded portion receiving the outer screw-threaded bottom portion of ahollow brass valve-seat member and guide 10 which when screwed theproper distance into the ring 7 is arrested by the limiting shoulder orflange 11, the member 10 terminating in an upper enlarged portion 10which forms ashoulder or annular seat h for engagement with the free endof the lower' or depending portion of the hub 4. The outer wall of theis provided with studs or lugs 12 for application thereto of a wrench ore uivalent tool (not shown) by means of w ich the-member 10 may bescrewed into or unscrewed from the ring 7.

Spanning the member 10 at a point substantially at the base of theenlargement 10 are diametrically disposed arms 13 radiating from acentral hollow hub or guide 14, forming a spider through which freelyoperates the stem 15, said stem projecting upwardly well into the bell 3where it terminates in a lock nut n and washer lw, a coiled expansionbalance spring 16 encircling the stem being interposed between thewasher and the bearing orhub 14, the latter serving as a stationary orixed abutment for the spring, the tension whereof may be readilyadjusted by the nut n and washer w which jointly serve as an adjustableabutment for the spring. Obviously, the screen 5 must have a sectionremoved therefrom to allow for the free passage therethrough of the stem15 with its encircling spring 16. The lower screw-threaded terminal orthat projecting below the hub 14 is screwed into the socket t at theapex of the conical portion of the check-valve V, the base of the conehaving depending therefrom the cylindrical portion e, between which andthe conical portion is formed an inclined or conical seat b -`adapted toengage a corresponding inclined seat b adapted to engage a correspondinginclined seat b on the lower end of the member 10 l(Figs. 1, 3).Disposed on the conical portion of the valve V are a series of radiatingvanes, wings or ribs 17 terminating substantially even with the free endof the socket t, the outer edges of the vanes being disposed alongthesurface of a' cylinder and freely playing in the cylindrical bore orpassage of the seat member 10. The tension of the spring 16 is soadjusted that it is just sutlicient to overcome the gravity or weight ofthe valve V, its stem 15 and wings 17 and normally hold the valve to itsseat on the member 10. Preferably the parts V, 15, 17 are composed ofaluminum or other light material, thereby requiring 4acomparatively-weak spring to hold the valve to its sea-t, a slightaccumulation of water on the valve serving to overcome the tension ofthe spring, thus unseating the valve and. allowing the water to draininto the sewer pipe.

The operation of the trap can be readily understood from the foregoing.The assembling of the several parts of the trap may be accomplished bythe ordinary mechanic, and the manner of assembling having beensuliciently described need not be repeated. It is apparent that no sewerwater can back through the trap inasmuch as the packed joints form sealswhich are both water and gas tight (that is to say the joints packed bythe rings 8, 9), and any back pressure 'will tend to all the moreforcibly drive the valve- V to its seat. The permanent seating of thevalve prevents any sewer gas leaking y past the valve and contaminatingthe atmosphere in the room where the trap is situated. Surface'watersflushed or directed into the basin 1 will flow upwardly over the upperedge of lthe hub 4 past the strainer 5, thence through the hub 4 andmember 10 on top of the valve, and the moment the weight of the waterresting on the vlvalve overcomes the tension of the weak spring 16, thevalve is unseated and the water escapes through the pipe 6.

In lieu of providing al ring 7 with the.' valve-seat member 10 screwedthereto, I ma provide av single member 20 of a formsucv as shown in Fig.6, seated on the shoulder s, the upper portion of said member beingprovided with a flaring extension d leading from a point below the upperend of the cylindrical portion of the member, thus central hub, avalve-stem forming an annular trough z', the bottom of igly the partscorresponding to those de-l scribed in connection with the first formare identified by the same reference symbols. I do not of course wish tobe limited to the precise details shown as they may in a measure bedeparted from without affecting the nature or spirit of my invention.Obviously, the invention is not restricted speciically to sewer traps,but may be applied` to any drain trap.

Should any gases for any reason leak past the valve, they would` bechecked by the water seal formed between the lower edgev of the bell 3and the upper end of the hub 4, a small amount of water whose surface isyrepresented by the dotted line usually remaining in the bottom of thebasin to form such seal. Of course if the seat surfaces b, b', arecarefully machined and made true and the balance spring 16 carefullyadjusted to normally keep the Avalve seated, the chances are slight thatany gases will get by the valve.

The valve B being hollow permits a cushion of air to accumulate under itwith a sudden rise of back water. This action allows dispensing withtheI spring 16 in cases where there is no sewer gas, the valve beinglifted by said air cushion, and seated before any water can pass thevalve.

Having described my invention, what I claim is:

In combination with a trap-basin provided with a ycentral hollowdischarge hub having a portion depending below the basin bottom, a drainpipe terminating in an upper terminal enlargement about the axis of thehub, a hollow valve-seat member engaging the depending portion of thehub aforesaid and forming a seal with the enlargement of the drain pipe,a member spanning the valve-seat member at the base of the dependingportion aforesaid and provided with a loosely operating through, andextending partly above and partly "below said hub, and aspring-controlled valve on the stem maintained in cooperative relationto the valve-seat member.

In testimony' whereof I aiix my signature,

in presence of two witnesses.

GEORGE W. MOON.

